resizable-array-buffers.js

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// |jit-test| --enable-arraybuffer-resizable; skip-if: !ArrayBuffer.prototype.resize

const scopes = [

  "SameProcess",

  "DifferentProcess",

  "DifferentProcessForIndexedDB",

];

function testInt32Array(scope) {

  var length = 4;

  var byteLength = length * Int32Array.BYTES_PER_ELEMENT;

  var maxByteLength = 2 * byteLength;

  var ab = new ArrayBuffer(byteLength, {maxByteLength});

  assertEq(ab.resizable, true);

  assertEq(ab.byteLength, byteLength);

  assertEq(ab.maxByteLength, maxByteLength);

  var ta1 = new Int32Array(ab);

  assertEq(ta1.byteLength, byteLength);

  ta1.set([1, 87654321, -123]);

  assertEq(ta1.toString(), "1,87654321,-123,0");

  var clonebuf = serialize(ta1, undefined, {scope});

  var ta2 = deserialize(clonebuf);

  assertEq(ta2 instanceof Int32Array, true);

  assertEq(ta2.byteLength, byteLength);

  assertEq(ta2.toString(), "1,87654321,-123,0");

  assertEq(ta2.buffer.resizable, true);

  assertEq(ta2.buffer.byteLength, byteLength);

  assertEq(ta2.buffer.maxByteLength, maxByteLength);

  ta2.buffer.resize(maxByteLength);

  assertEq(ta2.byteLength, maxByteLength);

scopes.forEach(testInt32Array);

function testFloat64Array(scope) {

  var length = 4;

  var byteLength = length * Float64Array.BYTES_PER_ELEMENT;

  var maxByteLength = 2 * byteLength;

  var ab = new ArrayBuffer(byteLength, {maxByteLength});

  assertEq(ab.resizable, true);

  assertEq(ab.byteLength, byteLength);

  assertEq(ab.maxByteLength, maxByteLength);

  var ta1 = new Float64Array(ab);

  assertEq(ta1.byteLength, byteLength);

  ta1.set([NaN, 3.14, 0, 0]);

  assertEq(ta1.toString(), "NaN,3.14,0,0");

  var clonebuf = serialize(ta1, undefined, {scope});

  var ta2 = deserialize(clonebuf);

  assertEq(ta2 instanceof Float64Array, true);

  assertEq(ta2.byteLength, byteLength);

  assertEq(ta2.toString(), "NaN,3.14,0,0");

  assertEq(ta2.buffer.resizable, true);

  assertEq(ta2.buffer.byteLength, byteLength);

  assertEq(ta2.buffer.maxByteLength, maxByteLength);

  ta2.buffer.resize(maxByteLength);

  assertEq(ta2.byteLength, maxByteLength);

scopes.forEach(testFloat64Array);

function testDataView(scope) {

  var length = 4;

  var byteLength = length * Uint8Array.BYTES_PER_ELEMENT;

  var maxByteLength = 2 * byteLength;

  var ab = new ArrayBuffer(byteLength, {maxByteLength});

  assertEq(ab.resizable, true);

  assertEq(ab.byteLength, byteLength);

  assertEq(ab.maxByteLength, maxByteLength);

  var ta = new Uint8Array(ab);

  ta.set([5, 0, 255]);

  assertEq(ta.toString(), "5,0,255,0");

  var dv1 = new DataView(ab);

  assertEq(dv1.byteLength, byteLength);

  var clonebuf = serialize(dv1, undefined, {scope});

  var dv2 = deserialize(clonebuf);

  assertEq(dv2 instanceof DataView, true);

  assertEq(dv2.byteLength, byteLength);

  assertEq(new Uint8Array(dv2.buffer).toString(), "5,0,255,0");

  assertEq(dv2.buffer.resizable, true);

  assertEq(dv2.buffer.byteLength, byteLength);

  assertEq(dv2.buffer.maxByteLength, maxByteLength);

  dv2.buffer.resize(maxByteLength);

  assertEq(dv2.byteLength, maxByteLength);

scopes.forEach(testDataView);

function testArrayBuffer(scope) {

  var length = 4;

  var byteLength = length * Uint8Array.BYTES_PER_ELEMENT;

  var maxByteLength = 2 * byteLength;

  var ab = new ArrayBuffer(byteLength, {maxByteLength});

  assertEq(ab.resizable, true);

  assertEq(ab.byteLength, byteLength);

  assertEq(ab.maxByteLength, maxByteLength);

  var ta = new Uint8Array(ab);

  ta.set([33, 44, 55, 66]);

  assertEq(ta.toString(), "33,44,55,66");

  var clonebuf = serialize(ab, undefined, {scope});

  var ab2 = deserialize(clonebuf);

  assertEq(ab2 instanceof ArrayBuffer, true);

  assertEq(new Uint8Array(ab2).toString(), "33,44,55,66");

  assertEq(ab2.resizable, true);

  assertEq(ab2.byteLength, byteLength);

  assertEq(ab2.maxByteLength, maxByteLength);

  ab2.resize(maxByteLength);

  assertEq(ab2.byteLength, maxByteLength);

scopes.forEach(testArrayBuffer);